01654nas a2200169   4500000000100000000000100001008004100002260002100043100001800064700001800082700001700100245007700117856005800194300001200252490000700264520121300271       2009                            d  cNovember 1, 20091 aEsther Sumner1 aPeter Talling1 aLawrence Amy00aDeposits of flows transitional between turbidity current and debris flow  uhttp://geology.gsapubs.org/content/37/11/991.abstract  a991-9940 v373 aThe relationship between submarine sediment gravity flows and the character of their deposits is poorly understood. Annular flume experiments were used to investigate the depositional dynamics and deposits of waning sediment-laden flows. Decelerating fast (3 m/s) flows with fixed sand content (10 vol\%) and variable mud content (0\textendash17 vol\%) resulted in only four deposit types. Clean sand with a mud cap that resembled a turbidity current deposit (turbidite) formed if the flow was turbulent when deposition began, or if the muddy fluid had insufficient strength to suspend the sand. The clean sand could contain structures if mud content was low (6\%) and the deceleration period was 300 s. Ungraded muddy sand with a mud cap that resembled a debris-flow deposit (debrite) formed if the flow became laminar before sand could deposit. Clean sand overlain by ungraded muddy sand and a mud cap formed either from a transitional flow or by late-stage settling of sand from a muddy suspension. These deposits resemble enigmatic submarine flow deposits called linked debrite-turbidites. The experiments provide a basis for inferring flow type from deposit character for submarine sediment-laden flows.